Calculator for easy assessment of photographic formula's cost. You enter quantities, dilution, packaging and price and get right away how much one liter of that working solution costs. Very... +

Manoeuvres when using a Petzval type portrait lens

With modern lenses it is possible to focus on any part of an image and get a sharp spot while keeping composition as it pleases us. With old lenses, Petzvals for instance, even adjusting the best focus, the peripheral parts of an image will never come out sharp, unless we stop down the lens. This article discusses how to use a large-format camera for situations where the subject we want sharp is far from the optical center of the lens and we want it fully open. read more …

Linhof 23, one camera for whatever kind of photography

The Linhof Super Technika 23 is a medium format camera that combines the features of a rangefinder point & shoot with those of a large format camera with ground glass, film and lens movements. Linhof proposed a lens system and the camera may use film 120 or sheet film in 2¼ x 3¼ ” format. Incredibly creative design and work in fine mechanics. read more…

William Wray,an English rapid rectilinear

One of the first lenses manufactured by the Englishman William Wray when, in addition to instruments for astronomy, he decided to dedicate himself to photographic lenses. Manufactured around 1885, with serial number 490, it uses diaphragms with five openings selected by means of a rotating disc. Later, Wray would be an important player in promoting the advantages of the today’s universal diaphragm iris system. read more …

Understand focal length, angle of view and image circle

How can a 300mm lens be wide-angle and another 300mm lens be considered long focus? In this article you will learn or review the three basic parameters that define a lens: focal length, angle of view and image circle. You will be able to understand and evaluate the use of any lens for any format. leia mais…

Tutorial with video for building up a photography contact printer. That can be used for large format photographs and also for UV alternative/historical processes like Van Dyke Brown, Cyanotype, Gum Dichromate, Salted Paper, Platinum/Palladium among others.

Application creates a .pdf for a bellows used on photo cameras of any size. The drawing indicates the cut-and-fold lines in life size. You indicate the measures, pay via Pay Pal and receive the project by email within a few minutes.

Using Petzval-type lenses for portraits when the subject's face is out of the center of the image requires some care. The article discusses and gives an example of how to decentralize the lens to reposition its optical axis over more peripheral areas of the photographic frame.

Find a compact set of chemical reagents, 8 in total, that will allow you to develop film and print B&W photographies. With instructions about mixing, using and cost considerations. A nice starting point if you are interested in setting up a photography darkroom and make your own chemicals.

Article explains why and how color-depth concept is necessary to express the array of different colors a digital system can handle. It clarifies why it must be expressed in bits, what that means in terms of color differentiation, when true-color is reached and why sometimes more than true color...

This is a calculator that will help you in finding the focal length of a photographic lens. The method is about focusing on one or more objects at different distances. Each time, you write down 3 measurements: Object size Image size How much did you advance the lens from infinity position in...

Pinhole is a photographic technique that employs most of the times a home made camera in different degrees of improvisation and roughness. Matchboxes, shoeboxes and whatever boxes and containers are sort of starting point for those projects. The photographer bricoleur may also start from scratch by...